Storing rendered HD projects from Sony Vegas

What is the best way to compress HD video projects on an external harddrive without quality deterioration? I have been using Sony Vegas Pro 9.0 for editing my HDCAM-EX clips taken by JVC GY HM100U in 1980/1080p/30 resolution. The movies come out in huge uncompressed .avi files and my 1TB G-RAID fills up too quickly. I understand I need to compress the files, but I don't want to compromise the quality.
Any tips appreciated.

Either. Your JVC GY-HM100u is an officially supported camera in NeoScene. In fact, you need only NeoScene if all you're going to do with a Cineform program is to re-encode your original camcorder footage to an easier-to-edit format.

Thank you.
I actually don't have any problem editing my HDCAM-EX footage from the camcorder in the Vegas 9.0. It's just that I am getting an uncompressed .avi file after rendering and would like to store it in a smaller form without quality sacrifice. I hope the neoScene can be used for that, too. I guess another option is simply to burn a bluray disc each time my 1TB G-RAID is getting too full.